CN105305811B - Charge pump drive circuit system for stepper motor - Google Patents
Charge pump drive circuit system for stepper motor Download PDFInfo
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- CN105305811B CN105305811B CN201410314657.5A CN201410314657A CN105305811B CN 105305811 B CN105305811 B CN 105305811B CN 201410314657 A CN201410314657 A CN 201410314657A CN 105305811 B CN105305811 B CN 105305811B
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Abstract
A kind of charge pump drive circuit system for stepper motor of the invention, charge pump change-over circuit its specifically mainly include at least one pair of switching tube, a pair of switches pipe, the first electric capacity, the second electric capacity and four switching tube drivers；Feedback control circuit detects the voltage and output voltage size of electric capacity two-plate, and according to testing result, generate pulse width modulating signal, the conducting and cut-off of controlling switch pipe, so that the charge pump circuit works in first stage, second stage, phase III and fourth stage respectively, the charge and discharge to pump electric capacity, the charging to output capacitance, so as to complete the boost function required for charge pump are completed in the different stages.The present invention is in the presence of feedback control circuit, output voltage Vout of the charge pump circuit by input voltage vin boosting for size according to input voltage linear change.
Description
Technical field
The present invention relates to boost electrical charge field of circuit technology, and in particular to a kind of charge pump for stepper motor drives electricity
Road system.
Background technology
As shown in figure 1, the schematic diagram of the charge pump circuit of the prior art with stable-pressure device.Known charge pump electricity
Road is mainly made up of the first electric capacity C1, the second electric capacity C2 and on-off circuit.Specifically, switch combination circuit is by first switch
S1, second switch S2, the 3rd switch S3 and the 4th switch S4 compositions.First switch S1 is coupled in input voltage vin and first
Between electric capacity C1 first electrode NA.Second switch S2 be coupled in the first electric capacity C1 first electrode NA and ground reference status it
Between.3rd switch S3 is coupled between input voltage vin and the first electric capacity C1 second electrode NB.4th switch S4 is coupled in the
Between one electric capacity C1 second electrode NB and output end OUT.Second electric capacity C2 first electrode NC is coupled in output end OUT, because
This also it is related be coupled in the 4th switch S4.Second electric capacity C2 second electrode ND is coupled in input.
The operating method of known charge pump circuit is made up of first stage and second stage.In the first phase,
One with the 4th switch S1 and S4 all in not on-state and second with the 3rd switch S2 and S3 it is all in the conduction state so that
First electric capacity C1 first electrode NA is coupled in ground reference potential and the first electric capacity C1 second electrode NB is coupled in input
Voltage Vin.Therefore in the first phase, the first electric capacity C1 is electrically charged so that the potential difference between second and first electrode NB and NA
It is increased to a Vin.Then in second stage, first and the 4th switch S1 and S4 it is all in the conduction state and second and the
Three switch S2 and S3 are all in not on-state so that the first electric capacity C1 first electrode NA be coupled in input voltage vin and
First electric capacity C1 second electrode NB is coupled in output end NC.As a result, when second stage starts, the first electric capacity C1 the second electricity
Voltage at the NB of pole was improved to 2*Vin from the Vin moments of script.S4 is switched via the 4th turned on, this voltage 2*Vin is applied
Add output end NC so that known charge pump circuit is able to effectively provide 2*Vin output voltage Vo1.
Charge pump circuit is only capable of providing the output voltage Vo1 for being fixed on 2*Vin in the case of no stable-pressure device.In order to
The output voltage Vout that can arbitrarily be adjusted between Vin and 2*Vin is provided, it is known that charge pump circuit the second electric capacity C2 the
Linear voltage regulator must be additionally set between one electrode NC and output end OUT.According to drive circuit to charge pump output voltage
Requirement, linear voltage regulator will be converted between Vin and 2* with the pump voltage Vo1 on the second electric capacity C2 first electrode NC
Output voltage Vout between Vin.Although fixed pump voltage Vo1 is effectively converted between Vin by linear voltage regulator
Adjustable output voltage Vout between 2*Vin, but linear voltage regulator causes decrease in efficiency and wastes the energy
The shortcomings that.
As shown in Fig. 2 stepper motor driver chip H bridges driving voltage is related to its supply voltage range with supply voltage
Greatly, and requiring that H bridge driving voltages follow input voltage linear change, linear voltage regulator is difficult to normal work under hyperbaric environment,
Output voltage can not be kept to follow the linear variation relation of input voltage.Therefore, existing charge pump is not changing its topology
It is difficult to meet this requirement under structure.
The content of the invention
In view of the above-mentioned problems, the present invention provide that a kind of output voltage follows input voltage linear change be used for stepper motor
Electric charge drive circuit system.
The present invention is used for the electric charge drive circuit of motor, including at least charge pump change-over circuit and feedback control circuit, its
Described in charge pump change-over circuit comprise at least be made up of a pair of PMOS switch pipes and a pair of nmos switch pipes and the first electric capacity
H bridges topological structure, the second electric capacity for being coupled between ground potential and output end, wherein described a pair of PMOS switch pipes and
A pair of nmos switch pipes each connect the first driver, the second driver, the 3rd driver and fourth drive respectively；
The feedback control circuit, pulse width signal is generated, control described PMOS switch pipe and nmos switch pipe
Conducting and shut-off, the conducting based on the PMOS switch pipe and the nmos switch pipe control the charge pump conversion electricity with shut-off
Road is respectively at first stage, second stage, phase III and fourth stage, wherein, first stage, the first electric capacity is completed to fill
Electricity, the constantly outside output current of the second electric capacity；Electric second stage, the first electric capacity neither charge nor discharged, and the second electric capacity continues
Outside output current；Phase III, the electric discharge of the first electric capacity, the second electric capacity is charged, and electric current is provided to output loading；
Fourth stage, the first electric capacity are in floating state, the outside output current of the second electric capacity, and charge pump completes the charge and discharge of a cycle
Electric process.
Further, the feedback control circuit comprises at least OSC oscillators, voltage comparator and pulse width modulation
Device, wherein the voltage comparator is used to detect the voltage of electric capacity two-plate and the size of output voltage, according to detection structure life
Into pulse width modulating signal, the conducting and cut-off of described switching tube are controlled.
Beneficial effect of the present invention：
The present invention realizes a kind of charge pump booster circuit that can be used in stepper motor, the output electricity of the charge pump circuit
Pressure follows input voltage linear change, can have higher conversion as the drive circuit of the high pressure DMOS pipe of stepper motor
Efficiency and fairly simple structure.
Brief description of the drawings
The schematic diagram of Fig. 1 charge pump circuits of the prior art with stable-pressure device；
Fig. 2 is stepper motor driver chip H bridges driving voltage and supply voltage relation；
Fig. 3 is the circuit diagram for the charge pump drive circuit system that the present invention is used for stepper motor；
Fig. 4 is the charge pump drive circuit system output voltage VCP detection circuit diagrams that the present invention is used for stepper motor；
Fig. 5 is the left polar plate voltage CP1 detections of the electric capacity of charge pump drive circuit system first that the present invention is used for stepper motor
Circuit diagram；
Fig. 6 is the circuit diagram of charge pump drive circuit system drive 2 that the present invention is used for stepper motor；
Fig. 7 is that the present invention is used for the charge pump drive circuit System Charges pump work clock signal of stepper motor and pulse is believed
Number circuit diagram.
Embodiment
With reference to Figure of description, the present invention will be further described.
As shown in figure 3, the present embodiment is used for the charge pump drive circuit system of stepper motor, boosted charge pump circuit has
Charge pump change-over circuit and feedback control circuit.Feedback control circuit control the conducting of PMOS switch pipe and nmos switch pipe with
Shut-off so that the charge pump circuit works in first stage, second stage, phase III and fourth stage respectively, in difference
Stage complete to the charge and discharge of pump electric capacity, the charging to output capacitance, so as to complete the boosting work(required for charge pump
Energy.In the presence of double feedback control circuits, charge pump circuit is by input voltage vin boosting needed for stepper motor driver chip
That wants follows the voltage Vout of input voltage linear change.
The present embodiment, described boosted charge pump circuit, it has output end, charge pump change-over circuit and feedback control
Circuit processed.The output port connects the second electric capacity Cout and output loading respectively, and the second electric capacity provides output current to load.The electricity
Lotus pump change-over circuit has the first electric capacity Cpump, the second electric capacity Cout, a pair of nmos switch circuits and PMOS switch circuit.The
Two electric capacity Cout are coupled between the output end and ground reference current potential.Feedback control circuit controls nmos switch circuit and PMOS
The conducting and shut-off of on-off circuit, make charge pump change-over circuit work in respectively the first stage, second stage, the phase III and
Fourth stage.In the first phase, MN1 is turned on, MN2 cut-offs, MP1 cut-offs, MP2 conductings, and the first electric capacity Cpump is coupled to ground letter
Number between input voltage, the second electric capacity Cout is coupled between output loading and ground；In the second stage, MN1 cut-offs,
MN2 ends, and MP1 cut-offs, MP2 conductings, the first left pole plates of electric capacity Cpump are hanging, and right pole plate connects power supply, the second electric capacity Cout couplings
Between output loading and ground；In the phase III, MN1 cut-offs, MN2 conductings, MP1 conductings, MP2 cut-offs, the first electric capacity Cpump couplings
Together between input voltage and output end, second is capacitively coupled between output end and ground；In fourth stage, MN1 cut-offs,
MN2 ends, MP1 cut-offs, MP2 cut-offs, and the first electric capacity Cpump left pole plate and right pole plate are all in floating state, the second electric capacity
Cout is coupled between output end and ground.For charge pump when the first stage, the first electric capacity Cpump completes charging, the second electricity
Hold constantly outside output current；When second stage, the first electric capacity Cpump neither charges nor discharged charge pump, and second
Electric capacity Cout continues outside output current；Charge pump is when the phase III, the first electric capacity Cpump electric discharges, to the second electric capacity
Cout is charged, and provides electric current to output loading；When fourth stage, the first electric capacity Cpump is in charge pump
Floating state, the outside output current of the second electric capacity, charge pump complete the charge and discharge process of a cycle.Charge pump passes through constantly
Charge and discharge repeats, to maintain output voltage VCP stabilization.
As shown in figure 4, it is the output voltage VCP detection circuits of the present embodiment.It is different from conventional output voltage detection electricity
Road, the pressure difference VCP-VBB for focusing on output voltage and supply voltage of output detection circuit detection of the invention.And VCP
Voltage change range is big, and common metal-oxide-semiconductor can not use under hyperbaric environment, therefore may not be usable for VCP detections.This circuit introduces high
PNP pipe is pressed, it is pressure-resistant between its colelctor electrode and emitter stage to can reach 60V, detection voltage VCP is connect into high pressure PNP pipe emitter stage, power supply
Voltage VBB connects high pressure PNP pipe base stage, while introduces compensation electric current VBE/R, then
R1 and R2 size is rationally set, that is, completes the setting to VCP threshold test voltages：VCPTH=VBB+VrefR1/
R2。
Vref voltages, R1 and R2 sizes are set, you can flexibly set VCP threshold voltage, and VCP detection threshold value voltages
Follow VBB linear changes.
As shown in figure 5, the left polar plate voltage CP1 detections circuit of first electric capacity of the present embodiment.It is similar with VCP detection circuits,
This detection circuit have also been introduced compensation electric current VBE/R1, then by Fig. 4
While V01 and (VBB-VCP1) linear relationship is obtained, formula formula also can obtain
The charge threshold voltage of the left pole plate of second electric capacity can be easily set according to formula.
It is the circuit diagram of driver 2 of the present invention shown in Fig. 6.R1=M*R2 in Fig. 6, MN1 and M1 breadth length ratio ratio are N,
Resistance R2 resistance very littles in circuit design, R2*Ir2 ＜ ＜ Vth, then flowing through MN1 size of current is
Iout=Iref×(M-1)×(N+1)
Iref size of current, resistance R2 and R1 ratio and MN1 pipe M1 pipe breadth length ratio ratios are rationally set, you can are managed
The discharge current thought, coordinate CP1 voltage detection modules, the first electric capacity Cpump charging voltage sizes can be preferably set.
The course of work of charge pump in the present invention is described in detail below according to signal waveform Fig. 6 of charge pump of the present invention.
After electricity on charge pump circuit, square-wave signal to the pulse that the continuous output duty cycles of oscillator OSC are 50% is believed
Number modulating unit, the clock signal clk as shown in Fig. 7.In the signal waveform shown in Fig. 6, VCP_DET examines for output voltage
The testing result of module is surveyed, when testing result is low level, represents that output result is less than predeterminated voltage output valve.Work as detection
When being as a result high level, illustrate that output level is higher than default output valve.CP1_DET is the left polar plate voltage detection knot of the first electric capacity
Fruit, when testing result is low level, illustrate that left polar plate voltage CP1 is higher than setting value, when testing result is high level, explanation
Left pole plate CP1 is less than setting value.PHASEA, PHASEB and PHASEC are respectively driver 1 and 4, driver 3 and driver 2
Input signal.Then closing switch pipe, signal then open switching tube when being 1 when signal is zero.Pass through the continuous opening of switching tube
With closing, the second electric capacity Cout constantly charge and discharges, so as to maintain the steady of output voltage, reach preferably output electricity
Press Effect value.
In the time t0 stage, for charge pump in the first stage, clock signal is low level, and driver 1 closes first
PMOS MP1, driver 2 open the first NMOS tube MN1, and driver 3 opens the second PMOS MP2, and driver 4 closes second
NMOS tube MN2.The left pole plate ground connection of first electric capacity Cpump, right pole plate connect power supply, and the first left polar plate voltages of electric capacity Cpump constantly drop
Low, right polar plate voltage is constant, completes charging process, until two-plate pressure difference reaches specified threshold (CP1 ＜ CP1TH), charge pump
Circuit enters second stage (time t1 section).The second outside output currents of electric capacity Cout, output voltage VCP are constantly reduced.
In stage time t1, charge pump and second stage, clock signal are low level, and driver 1 closes first
PMOS MP1, driver 2 close the first NMOS tube MN1, and driver 3 opens the second PMOS MP2, and driver 4 closes second
NMOS tube MN2.The first left pole plates of electric capacity Cpump are hanging, and voltage swing is constant, and right pole plate connects power supply.Second electric capacity Cout continues
Outside output current, output voltage VCP are constantly reduced, until clock signal high level arrive, charge pump enter the phase III (when
Between t2 sections).
In stage time t2, for charge pump in the phase III, clock signal is high level, and driver 1 opens first
PMOS MP1, driver 2 close the first NMOS tube MN1, and driver 3 closes the second PMOS MP2, and driver 4 opens second
NMOS tube MN2.The first left polar plate voltages of electric capacity Cpump rise to rapidly VBB, and right polar plate voltage, which also follows, rises to 2VBB-
CP1th, right polar plate voltage are higher than VCP, and the first electric capacity Cpump is externally discharged, outside output current, and the second electric capacity Cout is entered
Row charging, constantly charges along with the second electric capacity Cout, and output voltage constantly rises, until output voltage is higher than threshold voltage
VCPth, charge pump enter fourth stage (time t3 section).
In stage time t3, for charge pump in fourth stage, clock signal is high level, and driver 1 closes first
PMOS MP1, driver 2 close the first NMOS tube MN1, and driver 3 closes the second PMOS MP2, and driver 4 closes second
NMOS tube MN2.First electric capacity Cpump is in suspended state, and the second electric capacity Cout outwards discharges, and output voltage size constantly drops
Low, until saltus step is low level to clock signal again, charge pump is again introduced into the first stage, repeats the t0 periods.
One of the invention described in detail above there is output voltage to follow output voltage linearly to change, output voltage line
Ripple is small, the specific embodiment of high conversion efficiency, advantages of simple structure and simple.
To the present invention it should be appreciated that embodiment described above, to the purpose of the present invention, technical scheme and beneficial to effect
Fruit has carried out further details of explanation, these are only embodiments of the invention, is not intended to limit the present invention, it is every
Within the spiritual principles of the present invention, made any modification, equivalent substitution and improvements etc., the protection of the present invention should be included in
Within the scope of, protection scope of the present invention should be defined by the protection domain that claim is defined.
Claims (1)
- A kind of 1. charge pump drive circuit system for stepper motor, it is characterised in that：Including at least charge pump change-over circuit And feedback control circuit, wherein the charge pump change-over circuit is comprised at least by a pair of PMOS switch pipes and a pair of nmos switch pipes And first electric capacity the H bridges topological structure, the second electric capacity that is coupled between ground potential and output end that form, wherein described A pair of PMOS switch pipes and a pair of nmos switch pipes respectively each the first drivers of connection, the second driver, the 3rd driver and Fourth drive；The feedback control circuit, pulse width signal is generated, controls the conducting of described PMOS switch pipe and nmos switch pipe With shut-off, the conducting based on the PMOS switch pipe and the nmos switch pipe controls the charge pump change-over circuit point with shut-off Other places in first stage, second stage, phase III and fourth stage, wherein, first stage, the first electric capacity completes charging, the The constantly outside output current of two electric capacity；Electric second stage, the first electric capacity neither charge nor discharged, and the second electric capacity continues outwards defeated Go out electric current；Phase III, the electric discharge of the first electric capacity, the second electric capacity is charged, and electric current is provided to output loading；Fourth order Section, the first electric capacity are in floating state, the outside output current of the second electric capacity, and charge pump completes the charge and discharge process of a cycle；The feedback control circuit comprises at least OSC oscillators, voltage comparator and pulse-width modulator, wherein the electricity Pressure comparator is used to detect the voltage of electric capacity two-plate and the size of output voltage, and pulse width modulation is generated according to testing result Signal, control the conducting and cut-off of described switching tube；The voltage comparator includes output voltage detecting circuit, and the output voltage detecting circuit includes high pressure PNP pipe, compensation Current circuit, for detecting the pressure difference of output voltage and supply voltage, emitter stage and the output voltage of the high pressure PNP pipe Connect, the base stage of the high pressure PNP pipe connects with the supply voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410314657.5A CN105305811B (en) | 2014-06-28 | 2014-06-28 | Charge pump drive circuit system for stepper motor |
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| CN201410314657.5A CN105305811B (en) | 2014-06-28 | 2014-06-28 | Charge pump drive circuit system for stepper motor |
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| CN105305811B true CN105305811B (en) | 2018-01-26 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199578B (en) * | 2017-12-18 | 2020-04-28 | 普冉半导体（上海）有限公司 | Dual-output dual-feedback charge pump structure |
| CN108183599B (en) * | 2018-01-17 | 2021-02-23 | 上海艾为电子技术股份有限公司 | Driving device, charge pump circuit and edge rate control method thereof |
| CN108306502B (en) * | 2018-02-07 | 2020-06-05 | 上海艾为电子技术股份有限公司 | Charge pump circuit and electronic device using same |
| CN110224644B (en) * | 2019-06-12 | 2020-12-11 | 上海艾为电子技术股份有限公司 | Control method and driving circuit for controlling current ripple based on offset feedback voltage |
| CN113300590B (en) * | 2021-06-03 | 2023-04-25 | 上海南芯半导体科技股份有限公司 | Charge pump parallel current equalizing circuit based on duty ratio control |
| CN115118153B (en) * | 2022-06-25 | 2023-03-24 | 北京金诺美科技股份有限公司 | H-bridge driving circuit, driving method and device based on charge pump |
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| CN102882369A (en) * | 2012-10-26 | 2013-01-16 | 嘉兴禾润电子科技有限公司 | Novel charge pump circuit in chip for motor drivers |
| CN202931189U (en) * | 2012-10-26 | 2013-05-08 | 嘉兴禾润电子科技有限公司 | Charge pump circuit of motor driver |
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| KR20100094859A (en) * | 2009-02-19 | 2010-08-27 | 삼성전자주식회사 | Asymmetric charge pump and phase locked loops having its |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103631298A (en) * | 2012-08-28 | 2014-03-12 | 三星半导体(中国)研究开发有限公司 | Linear voltage stabilization source |
| CN102882369A (en) * | 2012-10-26 | 2013-01-16 | 嘉兴禾润电子科技有限公司 | Novel charge pump circuit in chip for motor drivers |
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